Search results
Results from the WOW.Com Content Network
Lisp was originally implemented on the IBM 704 computer, in the late 1950s.. The popular explanation that CAR and CDR stand for "Contents of the Address Register" and "Contents of the Decrement Register" [1] does not quite match the IBM 704 architecture; the IBM 704 does not have a programmer-accessible address register and the three address modification registers are called "index registers ...
AutoLISP is a small, dynamically scoped, dynamically typed Lisp language dialect with garbage collection, immutable list structure, and settable symbols, lacking in such regular Lisp features as macro system, records definition facilities, arrays, functions with variable number of arguments or let bindings.
A cons is a data structure with two slots, called its car and cdr. A list is a linked chain of conses or the empty list. Each cons's car refers to a member of the list (possibly another list). Each cons's cdr refers to the next cons—except for the last cons in a list, whose cdr refers to the nil value. Conses can also easily be used to ...
Common Lisp enhanced and standardized, published in ANSI standard document ANSI INCITS 226-1994; to the features of Common Lisp, it adds the loop macro, and the Common Lisp Object System (CLOS) to provide object-oriented programming paradigm with multiple dispatch (multimethods), and method combinations; runs on many platforms: Unix, Linux ...
the lists foo and bar are (a b c) and (x b c) respectively. However, the tail (b c) is the same structure in both lists. It is not a copy; the cons cells pointing to b and c are in the same memory locations for both lists. Sharing structure rather than copying can give a dramatic performance improvement.
This forms the basis of a simple, singly linked list structure whose contents can be manipulated with cons, car, and cdr. Note that nil is the only list that is not also a cons pair. As an example, consider a list whose elements are 1, 2, and 3. Such a list can be created in three steps: Cons 3 onto nil, the empty list; Cons 2 onto the result
In Bash the append redirect is the usage of ">>" for adding a stream to something, like in the following series of shell commands: echo Hello world! >text ; echo Goodbye world! >>text ; cat text The stream "Goodbye world!"
The Common Lisp HyperSpec is a technical standard document written in the hypertext format Hypertext Markup Language ().It is not the American National Standards Institute (ANSI) Common Lisp standard, but is based on it, with permission from ANSI and the International Committee for Information Technology Standards (INCITS, X3). [1]